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WordNet (r) 3.0 (2006) (WordNet)

quieten
v 1: become quiet or quieter; "The audience fell silent when the
speaker entered" [synonym: {quieten}, {hush}, {quiet},
{quiesce}, {quiet down}, {pipe down}] [ant: {louden}]
2: make calm or still; "quiet the dragons of worry and fear"
[synonym: {calm}, {calm down}, {quiet}, {tranquilize},
{tranquillize}, {tranquillise}, {quieten}, {lull}, {still}]
[ant: {agitate}, {charge}, {charge up}, {commove}, {excite},
{rouse}, {turn on}]
3: cause to be quiet or not talk; "Please silence the children
in the church!" [synonym: {hush}, {quieten}, {silence}, {still},
{shut up}, {hush up}] [ant: {louden}]